Now you are just making things up. Use photogrammetry software like I have or hire a photogrammetry expert and see for yourself.
If you don't fancy that, get your wife/partner to lie down flat and put a broomstick on her left breast and see for yourself.
David - look at a picture of the rifle in the “lowered” position. The end of the barrel is not in contact with Sheila’s body, this can be seen by the shadow in the picture that you posted.
Now look at the close up pictures in the “raised” position the end of the barrel immediately before the silencer screw (forward of the forward sights) is in contact with her neck, it can be seen from several angles - this cannot be paralax error